Lee Se-dol retires from Go game

> “Even if I become the number one, there is an entity that cannot be defeated,”

This is a chilling effect of the advancement of artificial intelligence and deep learning. If they can do it to Chess, Go, Starcraft, then they can do it to any game.

I won't be surprised to see e-sports ruined by grandmaster-level bots

I would actually think the opposite, he finally has someone to learn from.